<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <h1>this is index1.html</h1>
  <script>
    window.onmessage = function(e) {
      console.log(e);
      // e.source.postMessage('nonono', e.origin);
    }
  </script>
</body>
</html>